DESIGN-4069 feat: button 增加 setIcon 属性

demo/js/base/button/demo.button.js

@@ -376,6 +376,21 @@ Demo.Button = BI.inherit(BI.Widget, {
                 plain: true,
                 disabled: true
             }
+        }, {
+            el: {
+                type: "bi.button",
+                iconCls: "plus-font",
+                text: "点我，更改图标",
+                handler() {
+                    this.i =  this.i === undefined ? 0 : ++this.i;
+                    const arr = ["text-background-font", "check-mark-ha-font", "close-font", "search-font", "date-change-h-font"];
+                    if(this.i >= arr.length) {
+                        this.i = 0;
+                    }
+                    this.setIcon(arr[this.i]);
+                },
+                height: 24
+            }
         }];
         // BI.each(items, function (i, item) {
         //     item.el.handler = function () {

src/base/single/button/buttons/button.js

@@ -77,8 +77,8 @@
             }
             if (BI.isKey(o.iconCls)) {
                 this.icon = BI.createWidget({
-                    type: "bi.icon_label",
-                    cls: o.iconCls,
+                    type: "bi.icon_change_button",
+                    iconCls: o.iconCls,
                     width: this._const.iconWidth,
                     height: lineHeight,
                     lineHeight: lineHeight
@@ -195,6 +195,13 @@
             }
         },
 
+        setIcon: function (iconCls) {
+            if (this.icon) {
+                this.options.iconCls = iconCls;
+                this.icon.setIcon(iconCls);
+            }
+        },
+
         doRedMark: function () {
             this.text.doRedMark.apply(this.text, arguments);
         },